Lock construction



July 2, 1935'. E

LOCK CONSTRUCTION Filed June 13, 1934 a d 7 mW/W 1 .El. 50 I 1 62 63 64 7 R WIN/M 3 I MEN VII/l!!! INVENOR 1 Hem ZTKeil BY I I Patenteol July 2, 1935 z nrns Francis Keil & Son, Inc.,

- York incorporation of New AppiicationJune 13, 1934, Serial No. 730,417 7 16 Claims.

This invention relates, to lock construction and .more particularly to the key-controlled or keyoperated portion of a lock mechanism.

One of the objects-of this invention is to-providea practical; inexpensive and dependable keycontrolled lock mechanism. Another object is to provide,v a mechanism of the above-mentioned character that will be capable of great ease of disassembly or assembly, as for purposes of repair,-change of the combination to meet a diifere ent shape, ofkey, or the like. Another object is to provide a construction of the above-mentioned character in whichcertain of the tumbler pins and/or coacting devices may be easily and con veniently heldagainst disassembly or against falling out While permitting the disassembly from the lock construction of the parts of the latter. Another object is to provide a lock mechanism of'the'above-mentioned nature which will greatly facilitate and lessen the labor on the part of the locksmith in fitting akey to the lock or in performing other operations, such as changing the lock or tumbler arrangement s asto adapt the lock mechanism to another key, or folfjpurposes of repair, or the like. Another object, also, is'to provide a tumbler type of lock mechanism which will be of thoroughly reliable and dependable action in practical use and which in particular will be capable, in a simple and inexpensive manner, of resisting tamp-eringor unauthorized eiforts to manipulate it. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as willbe exemplifiedin the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims. 7

In the accompanying drawing in which is shown a preferred form of my invention, I Figure 1 is a verticalcentral sectionalview through the assembled key-controlled mechanism, showing the mechanism as related to a door and appropriate belt or latch-mechanism.

Figure 2 is a view, as seen from the right in Figure 1, certain parts being omitted;

Figure 3 is a transverse sectional view, as seen showing such portion detached from-the door: and

illustrating the construction and action of certain features of my invention;

ing.

Figure 6 is a vertical central sectional View of the key plug or barrel, as removed from the cylinder or casing, and

Figure '7 is an enlarged view of certain portions of ligure.

Similar reference characters *refer to similar partsthroughout the several views of the draw Referring now to the drawing, and 'more-particularly to Figure 1,1 have generally indicated at lt-a door, or the like, which has secured to it andcarries a suitable casing ll having therein anysuitable form of bolt, or the-like, and bolt- ;ooact, with a suitable keeper.

operating mechanism, the bolt being adapted to The bolt mechanism H is to be operated by a key-controlled mechanism constructed in accordance with my in.-

. Accordingly, housing generally'indicated at l2 preferably in vention.

I provide a casing or cylinder the form of a solid casting'suitably shaped to provide a substantially cylindrical lower" portion l3 (Figures 1 and 3) and an upwardly and lengthwise extending portion M, these portions being lar.

conveniently and preferably cast as a unit or ini as at iii, in order thereby to receive, and form a shoulder or abutment for the front peripheral flange l'l (Figure l) of the key plug ll, movement of the latter in.a direction toward the left bolt mechanism ll for coaction with and opera--. tion of ,the latter under the control of the key plug l1. Y I l Any suitable means may be employed to relate the key-controlled parts l2.-I l to the door ID and as viewed in Figure 1 being thereby limited.

. At its 1efthand end, as viewed in Figure l, the key plug ll, preferably projecting beyond thelefthand face ofthe cylinder housing lil, has detachably secured thereto, as by any suitable means generally indicated-at 19, a connecting or operating bar. which is to enter the casing of the hence to the bolt mechanism H; for example, the

door lil may be provided'with-a hole us of sumcient size to receive the casing l2; front flange E5 of the latter abutting against the right-hand face of the door Hi; the housing I2 is provided with ears 2|-22 (Figure 3) projecting laterally in Figure 1 at 6|, 62, 63, 64 and 65.

therefrom and having threaded holes therein for receiving screws 23 (Figure 1) which pass, excepting for their heads, through a plate 24 resting against or secured to the left-hand face of the door l0, screws 23, in coaction with the back plate 24 and the front flange l5 acting to clamp the door ||l therebetween and thus securely hold the parts in the. hole H) in the door. Back plate 24 is, of course, provided with a suitable hole 24 to permit the passage therethrough of the operating bar 20.

Considering now the interrelation between the plug casing l2 and the key plug it is first to be noted that the casing I2 is provided with a suitable number, illustratively five, of tumblerreceiving recesses indicated in Figure 1 at 3|, 32, 33, 34 and 35, these recesses preferably being cylindrical and either cast or formed by drilling, extending downwardly and opening into the bore H5 and extending upwardly into the above-described portion H (see Figures 4 and 1) of the housing structure |2. Slidably fitted or mounted in these tumbler-receiving recesses are cylindrical tumblers, sometimes called pins, indicated in Figure 1 at 4|, 42, 43, 44 and 45, these tumbler pins being preferably of the same length and being urged downwardly, as viewed in Figure 1, by springs 5|, 52, 53, 54 and 55, the upper ends of the springs abutting against the upper closing wall of the tumbler-receiving recesses.

These springs and tumblers may be inserted into their respective'recesses in any suitable manner; for example, the upper ends of the recesses, as formed in the portion M of the casing |2 (Figure 4) may be open so that the tumblers may first be dropped in and then the springs inserted whereupon the upper open ends of the recesses may be closed in any suitable way as, for example,

'by a closure plate 36 which extends lengthwise along the top of the casing portion l4 (Figure 1) in a guideway I4 (Figure 4) extending between upstanding ribs or flanges |4 and M which may, after the closure plate 36 has been put in place, be bent or pressed over, as indicated in Figure 4, to clamp and hold the closure plate 36 in place.

The rotatable key plug I1 is provided with a key slot extending lengthwise thereof, preferably throughout the lower portion of the key plug, as is better shown in Figure 3, and the vertical cross-section of the key slot may be given any desired shape or form; illustratively, it may have a shape like that shown in Figure 3, being'thus provided with longitudinally extending ribs and W The key plug I! is also provided with tumblerreceiving recesses which, when the plug I1 is in the position shown in Figures '1 and 3, assumed to be the normal position, register with the tumbler-receiving recesses 3 32, 33, 34, and 35 in the casing l2 and are the same in number, these respectively registering recesses being indicated The latter, also, are of the same cross-section as the former recesses so that, when the two sets of recesses are alined, the tumblers 4| 42, 43, etc. pressed downwardly by their respective springs, emerge from their recesses 3|, 32, 33, etc., respectively, and enter into the key plug recesses 6|, 62, 63, etc., respectively, to an extent determined by the lengths of tumblers 12, 13, I4 and I5, respectively, carried in the tumbler-receiving recesses of the key plug.

In Figure 1 the tumblers H, I2, '13, etc. are shown of varying or differing lengths, and hence the upper tumblers 4|, 42, 43, etc., project into the key plug recesses, thus preventing rotation of the key plug until a properly shaped key, shaped not only to enter the key slot (Figure 3) but also to have a suitably serrated or notched edge, raises all of the tumblers, each pair or set to such an extent that the upper tumblers 4|, 42, etc. are just lifted sufficiently to be moved out of the key plug recesses, whereupon the key plug I! may be rotated by the key and hence the bolt mechanism (Figure 1) actuated.

The lowermost position of the tumbler pins 1 E2, 13, etc. may be determined in any suitable manner as, for example, by the vertical depth (see Figure 1) of the recesses 6|, 62, 63, etc. in which they are respectively received, these recesses being formed in any suitable manner as by drilling or even casting, as by die casting; preferably these recesses are of the same depth and as indicated in Figures 1 and 4, they may terminate at about one of the ribs, such as rib of the key slot I1. Still assuming the parts to be in normal or locked position, as shown in Figures 1 and 4, I provide downward extensions of the tumbler recesses 6|, 52, 63, 64 and 65 in the key plug, but these extensions, shown in Figure 1 at 8|, 82, 83, 84 and 85, respectively, formed as by drilling or in the process of die casting, are of smaller cross-section or lesser diameter than the recesses 6|, 62, 63, etc.; thus these extensions 8|, 82, 83, etc. provide, with the tumbler-receiving recesses 6|, 62, 63, etc., respectively, a clear passage diametrically through the key plug H but because the lower portions or extensions 8 82, etc. are smaller in cross-section than the recesses BI, 62, etc., respectively, the tumblers or pins ll, 12, etc., do not enter these smaller recesses or extensions 8|, 82, etc., respectively, but the latter are available for a purpose about to be described in detail. 7

Additionally, it is to be noted and as is shown in Figures 1 and 4, and still assuming the parts to be in normal or locked position, as in Figure 1, the lower wall of the cylindrical casing portion I3 is provided with apertures 9|, 92, 93, 94 and 95, which are alined and mate with the recess extensions 8|, 82, 83, etc., respectively, thus making the latter accessible from the exterior of the casing |2. Furthermore, and as better appears in Figures 1 and 3, I provide a passage or hole |3 extending from'front to rear of the casing I2 and intersecting the tumbler-receiving recesses 3 32, 33, etc., in the latter; this passage I3 is closely spaced to the wall of the bore- H5 in which the key plug rotates (see Figure 3), it is exposed at the rear or left-hand end of the casing l2 (see Figure 1) but is normally covered up at the righthand or front end of the casing |2 by the flange ll of the key plug l1.

Considering these features of my invention, let it now be assumed that it is desired or necessary to fit a key to the lock mechanism or to change the latter so as to require a differently serrated or notched key. In accordance with heretofore known practice, such a procedure involves a difficult and troublesome task in that the lock mechanism has to be taken entirely apart, the numerous parts thereof, most of them relatively minute, spill or scatter and become mixed up or confused, and 'disregardingwhatever changes have to be made in the tumblers there results time-and patience-consuming operation in endeavoring to get the parts assembled again. But such detriments as these I eifectively eliminate and avoid and accordingly, assuming that the mechanism is now removed from the door I0, thus making available the rear exposed end of the pasright-hand end of the pin '31 which may there-1 upon be moved one step further toward theemergence therefrom by the pin 3?.

7 existing tumbler pinsll,

3 accrues sage -l 3 I insert into the latter'a Wireorpin-like member 31 (see now Figure 5), the pint! abut! tins against the upper. tumbler 4|; but thereupon Iinsert a pin-like member or Wire 38 (Figure mm the aperture 9! and thus into the extension at of tumbler recess 6| 'in the key plug ll and by then slowly pushing. up on the pin 38,31 move the tumblers H andjtl upwardly untiltheir juncture comes into alinement with the inner end of pin 3?, which may thereupon be pushed: further to theright in between tumbler pins 4| and H; closing the tumbler recess 3i; and continuing through the passage 53 through the; wall intervening tumbler'recesses 3i and 32, thus'abutting the pin 31 against tumbler pin 42. Thepin 38 is thereupon removed from aperture 9i and is. inserted into'aperture 92 and thus into the extension 82 of the tumbler recess 62 in the key plug ll,'.engaging the tumbler pin 72 in the latter; and. then by pushing slowly upwardly on the pin-33,. tumblers "i2 and 42 are lifted to bring theirjunotion in line with the right in between the tumblers 42- anclli, and then onto the nexttumbler arrangement, and so on, I

all the way through whatever number of tumbler recesses with tumblers that there might be in the lock construction, the pin SIfinally abut-- springs are imprisoned within their respective tumbler recesses,being held against spilling or The key plug il'may'then be withdrawn from the casing i2 and the locksmith'may do whatever is necessarywith respect to the latter and its tumbler pins.

For example, if it 'is' necessary to fit a key, he may then notch or cut a; key blank appro priately, being guided by the vertical dimensions of the tumbler pinsil; l2, 13; M and 15 as to the contour to te giventhe' key, thus tumbler pins being easily removable and easily replaceable, once the key plug H, has been removed.

' Or, to make the lock mechanism respond to a different shape of key, he may interchange the l2, '23, etc, or he may provide an entire new series of such pins and an appropriately contoured key. For example,

also, while the key plug i! is, thus still out of the casing 12, the locksmith may insert into the key slot 91? a notched or coded key, then drop appropriate tumblers in the tumbler recesses 6!,

62; 63, etc., and flle oif or otherwise remove such portions of the thus inserted tumblersas proflange .il ofthe key plug again fittinginto the counterbore iil and covering up the right-hand end of the passage '32, whereupon the. pin- 3] may be withdrawn, thus .to release the tumbler pins di, 42, etc. under the action of their respective springs and thus freeing them for coactionwith thekeyplug. The. operating bar 2G is again attached to the left or rear end of the keyplug l'l by'the means I 9 above mentioned,-

the latter again preventing withdrawal of the key plug 1 1 from its bore l5, and thus the mechdoor id.

anism may berestored or again mounted in'the It will be understood, also,-that, if desired, the

pin 31 may be associated with the casing ,l2 to hold the tumblersv within'the latter, during vari-- pin or wire. 38 inserted successively through therecess extensions 9!, 92, 83," etc; for example, an; implement may beinsertedinto the keyslot li suitably shaped or constructed to reach into the key slot to. engage first the tumbler pin it (Figures 1 and 5) and lift the latter and hence its associated upper tumbler, advance thepin 37,

then by this implement lit. the next tumbler 72, and so' on. tIn any-event,it will be-seen that I amenabled in a rapid and'thoroughlydependable manner to greatly facilitate disassembly, assembly, and particularly assembly succeeding disassembly as is so frequently'the case in the hands of a locksmith.

'-.I have above pointed out how, after manipulating the successive pairs of"turnblers and inserting the pin 31 (Figure5) the upper tumblers ll, 42, 43. etc. are imprisoned, being held disengaged from the key plug or barrel i! and that thereafter the latter may bewithdrawn; pref erably I also provide against spilling or disassembly of the'tumblers H, 12, 13, etc. from the key plug and in thatconnection reference may again be made to Figure 5.

.Hence, referringto Figure 5, I provide, in the key plug H, a passage I"! extending parallelto the axis of the key plug IT and adjacent the periphery of the latter and in a line such that the passage I1 commencing at the rear or left-hand face of the plugil,iintersects all of the tumbler recesses BI, 62, 63, 64 and 65in the key plug ll,

preferably adjacent the upper ends of the latter. Thespassage H however and preferably, terminates in back of'the front or right-hand face of the key plug ll, being thus'accessible only from the rear end of the plug. I

With no key in the key slot i'l the tumblers H, 12,13, etc; bottom in their respective rece'sses, the upper-ends of thetumblcr pins thus falling at or below the line of the passage H Accordingly, afterhaving inserted the pin 3i in the passage 13 as above described, a pinor wirelike member 50' (see now Figure 6) is inserted into the passage 'il so that it extends across all of the otherwise open ends of the tumbler-receiving recesses Si, 62, 63, etc; thus closing these recesses and iinprisoning the tumblers i i, l2; 13, etc. within theirrespecti've recesses. It is at this point, then, after thus having inserted the pin or wire 55, that the key plug it is withdrawn from the casing 52 as above described, appearing when thus withdrawn as shown in Figure 6. Thus, spilling of these tumblers from their recess isxdependably' precluded, and this feature is of particular advantage and importance where the tumblers in the key plug are of a composite construction and take the form-better shown in Figure 4 and'presently to be'described in detail;

Accordingly, unintentional removal of the pin tumblers and related parts from the key barrel is dependably prevented, confusion or mixing up ofthe pin tumblers precluded: and great convenience and speed of handling, whether in course of manufacture or in course of subsequent dis-' assembly for repair, brought about.

Thus, the disassembly and assembly are greatly facilitated and much annoyance and many timeconsuming manipulations are dependably eliminated. At the same time, however, another feature of my invention comes into play; as indicated above, the several pairs of tumbler pins may, in so far as the above-described features of my inventionare concerned, be of any desired or suitable construction or shape and preferably are solid but where these pairs of tumbler pins are solid, there may be some element of danger or risk involved due to the generally remote possibility, usually depending upon the range of change of vertical dimension of the tumbler pins in the key plug, of surreptitiously causing the tumbler pins to be raised sufficiently to permit rotation of the key plug IT by applying to the assembled and. installed lock mechanism, as to the front or escutcheon plate I 5 thereof, any suitable mechanism that will subject the lock mechanism to rapid andpowerful vibration. For example, an electric motor-driven vibrator, attached or applied to the front of the casing 3 subjects the latter and particularly the generally loosely mounted tumbler pins to rapid vibration, causing the tumbler pins to vibrate up and down in their respective recesses and thereby bringing about such a lifting thereof that, at an appropriately awaited stage of the Vibration, all of the tumbler pins are appropriately lifted or alined to permit freedom of rotation of the key plug relative to the casing l2. In accordance with my invention, I dependably guard against such possible unauthorized or keyless actuation of the lock mechanism.

Accordingly, and as is better shown in Figure 4, all or a suitable number of the tumbler pins in the key plug H are substantially cup-shaped, as is better shown in Figure 4 or, where they are cylindrical, they or a suitable number thereof are counterbored from the top. In Figure 4, and, on a larger scale, in Figure 7 tumbler H is shown thus counterbored as at I l Into this counterbore H is an auxiliary pin 39 whose length is such, better shown in Figure '7, that its upper end and the upper end of the tumbler pin lie in substantially the same plane; its diameter is greater than the diameterof the aperture 9| in the wall of the bore IE or in the casing portion 3 so that, should the key plug under the control of a key or otherwise, be rotated through 180, as it normally is in normal operation, the pin 39 will not fall out of either the main tumbler 1| or through the aperture 9|.

The upper tumbler 4| with which the lower tumbler 1| coacts may be made tubular, as shown in Figure '7 and in Figure 4, and its inside diameter is sufiiciently greater than the diameter of the auxiliary pin 39 so that the latter may easily enter the tubular tumbler 4|.

In normal or locked position of the parts, the relation therebetween is as shown in Figure 4 (see also Figure 7). The auxiliary pin 39 is virtually completely. housed within the main tumbler pin H, and the same relation of parts exists with respect to such other or others of the pairs of tumbler pins as are selected to be thus constructed. As thus constructed, the operation thereof under the control of a proper key is as already above described.

However, should the key-controlled mechanism replacement, or change,

be subjected to vibration of the character above described, thereby to cause the various pairs or sets of tumbler pins to vibrate or jump up and down in their recesses in the effort to bring about such forced or vibrating withdrawal of the upper tumbler pins 4|, 42, 43 etc. into their recesses and thereby permit unauthorized vibration of the key plug l, the same vibration becomes effective to cause the auxiliary pin 39 (Figure 4.) to vibrate or to jump up and down relative to the tumbler pin itself, thus bringing the auxiliary tumbler pin 39 up into the upper tumbler 4| and thus virtually telescopically making a unit out of the upper tumbler 4| and the lower tumbler II, a unit that is not separable, so long as the auxiliary pin 39 continues to vibrate, by relative movement between the two tumblers in a transverse direction.

Thus, even if the vibration were effective to bring about an adequate withdrawal of the upper tumblers 4|, 42, etc., to permit rotation of the key plug H, the same vibration is effective to keep the auxiliary pin 39 of the lower tumbler H (and the pins of such other of the lower tumblers as are similarly constructed) interengaged with the upper tumbler in such a way as to prevent the kind of transverse relative movement therebetween or between the pin 39 and the upper tumbler recess 3| as is necessary to ermit free rotation of the key plug IT.

The disassembly and reassembly of the construction where one or more of the pairs of tumbler pins have the features just above described and shown in Figure 4 proceeds substantially as earlier above described in detail but it is to be pointed out that the cup-shaped character of the lower tumbler pin 1| exposes the bottom or end wall thereof to the action of the pin 38 (Figure 5) that is used to raise the tumblers, and thus pin 38 raises not only the cup-shaped tumbler 1| itself but also its auxiliary pin 39 as well.

Thus, there has been provided in this invention a key-controlled lock construction in which the various objects hereinbefore set forthtogether with many thoroughly practical advantages are successfully achieved. It will be seen that the construction and arrangement are of a thoroughly practical character and are thus well adapted to meet the varying conditions of hard practical use. Moreover, it will be seen that the construction is capable of ready embodiment in practical form, is inexpensive, and makes for great major saving and great convenience in practice.

As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. In lock construction, in combination, a key plug having a longitudinally extending key-receiving slot and having a plurality of radially extending tumbler-receiving recesses communicating with said key slot, tumblers within said recesses, said recesses having extensions through to the other side of said key plug, thereby to expose said tumblers to the action of a device inserted in the plug through said extensions, a casing having a bore in which said key plug is movably received, said casing having a plurality of tumbler-receiving recesses with spring-pressed tumblers therein, one for each of the tumblers plug having a longitudinally extending key-receiving slot and having aplurality of radially extending tumbler-receiving recesses communicating with said key slot, tumblers within said recesses, a casing having a bore in which said key plug is movably received, said casing having a plurality of tumbler-receiving recesses with springpressed tumblers therein, one for each of the tumblers in said key plug, said casing having passage means extending into said second-mentioned tumbler-receiving recesses whereby, by inserting tool means through said passage means and upon lifting a pair of tumblers, said tool means may be moved underneath the casing tumblers, thereby to retain the latter with their springs within their recesses.

8. In lock construction, in combination, a key plug having a longitudinally extending keyreceiving slot and having a plurality of radially extending tumbler-receiving recesses communicating with said key slot, tumblers within said recesses, a casing having abore in which said key plug is movably received, said casing having a plurality of tumbler-receiving recesses with spring-pressed tumblers therein, one for each of the tumblers in said key plug, said casing having passage means accessible from a wall of the casing other than the front wall thereof and intersecting each of said second-mentioned tumblerreceiving recesses whereby, by inserting tool means into said passage means and successively lifting the pairs of tumblers, said tool means may be moved underneath the casing tumblers to restrain the latter from coaction with said key plug.

9. In lock construction, in combination, a key plug having a key-receiving slot and a radially extending tumbler-receiving-recess communicating with the slot, a tumbler within said recess, a casing movably mounting said key plug and having a tumbler-receiving recess opening against the key plug and having a spring-pressed tumbler therein, said casing having a bore in which said key plug is received that is of a diameter substantially equal to the diameter of said key plug, thereby to form a direct bearingfor said plug, and means forming a passage accessible from the exterior of the lock construction whereby tool means may be inserted and said casing tumbler may be receded by said tool means into its recess against the urge of its springand held against coaction with said key plug, thereby to permit removal or assembly of the key plug and casing.

10. In lock construction, in combination, a key .plug having akey-receiving slot and a radially extending tumbler-receiving recess, a cup-shaped tumbler within said recess, a pin within said cup-shaped tumbler and bottoming in the latter and terminating adjacent the open end thereof, and a casing movably receiving said key plug and having a tumbler-receiving recess opening against said key plug and having a hollow spring-pressed tumbler slidably mounted therein, said hollow tumbler being, when said key plug is in locked position, thereby juxtaposed to said cup-shaped tumbler and being capable of receiving said pin, whereby, upon said casing with the plug therein being subjected to vibration, said pin may oscillate between both of said tumblers.

11. In lock construction, in combination, a key plug having a key-receiving slot and a radially extending tumbler-receiving recess, a hollow tumbler within said recess, a casingmovably receiving said key plug and having a tumblerreceiving recess opening against said key plug and a hollow. spring-pressed tumbler therein, and a plunger normally contained within said firstmentioned hollow tumbler but slidable relative thereto and capable, upon said casing and key plug being subjected to forced vibration, of oscillating within both tumblers when the latter are alined.

12. In lock construction, in combination, a key plug having a key-receiving slot and a plurality of radially extending tumbler-receiving recesses communicating with said slot, tumblers within said recesses, a casinghaving a bore in which said key plug is movably received, said casing having a plurality of tumbler-receiving recesses opening into said bore with spring-pressed tumblers therein, one for each of the tumblers in said key plug, and adapted to be received within the recesses of the latter when said key plug is in .locked position, at least one pair of said tumblers being hollow and having therein a single slidable member normally received within one of the tumblers, thereby not to interfere with the actuation of the tumblers and key plug under the control of a key but capable of oscillating between both of the tumblers and thereby preventing relative transverse movement thereof when the lock construction is subjected to forced vibration.

13. In lock construction, in combination, a key plug having a key-receiving slot and a plurality of radially extending tumbler-receiving recesses communicating with said slot, tumblers within said recesses, a casing having a bore in which said key plug is movably received, said casing having a plurality of tumbler-receiving recesses opening into said bore with spring-pressed tumblers therein, one for each of the tumblers in said key plug, and adapted to be received within the recesses of the latter when said key plug is in locked position, and means housed within one of said tumblers and responsive to forced vibration of said casing and plug for preventing relative movement therebetween even if said forced vibration achieves release of said key plug by said casing tumblers.

14. In lock construction, in combination, a key plug having a key-receiving slot and a plurality of radially extending tumbler-receiving recesses communicating with said slot, tumblers within said recesses, a casing having a bore in which said key plug is movably received and the surface of said bore forming a bearing for the outer surface of said key plug, said casing having a plurality of tumbler-receiving recesses opening into said bore with spring-pressed tumblers therein,

one for each of the tumblers in said key plug, and adapted to be received within the recesses of the latter when said key plugis in locked position, said lock construction having passageway means for the reception of means capable, when actuated, of holding said second-mentioned tumblers against movement under the action of their respective springs, thereby to prevent said tumblers, in the absence of said key plug, from being pushed out of their respective recesses and to thereby permit withdrawal or inserting movement of said key plug relative to said casing, and for the reception of means capable, when actuated, of holding said first-mentioned tumblers within their respective recesses in said key plug so that, upon withdrawal or inserting movement of said key plug relative to said casing, said tumblers are retained within their respective recesses.

15. In lock construction, in combination, a key plug having a key-receiving slot-and a plurality of radiallyextending tumbler-receiving recesses (5 communicating with said slot, tumblers within said recesses, a casing having a bore in which said keyplug is movably received, said casing having means with which said tumblers ccact, said key plug having passage means extending into said ttunbler-receiving recesses whereby, by inserting tool means through said passage means, said tumbler-receiving recesses are closed against outward movement therefrom of said tumblers, therebyto retain thelatterassembled to said plug. p

16. In lock construction, in combination, a key plug having a key-receiving slot and a plurality of radially extending tumbler-receiving recesses communicating with said slot, tumblers within said recesses, a casing having a bore in which said-key plug is movably received, said casing having means with which said tumblers coact, and said plug having a passage extending from the rear face thereof substantially parallel to the axis of said plug and adjacent the periphery of the latter and intersecting all of said tumbler-receiving recesses whereby, upon the insertion of a member into said passage, the inserted member bridges across said tumbler-receiving recesses and prevents movement of the tumblers therein in a direction out'of said recesses. I

HENRY F., KEIL. 

